Answer Posted / khushpreet kaur.

Polymorphism is taken from the greek word which means "many
forms"...
So polymorphism means "to carry out operations of
different processing steps by function having same
messages".
when a base class member function can be overridden by
defining a derived class member function with same name as
that of the base class member function,then such type of
concept is called "Polymorphism".(one interface multiple
methods)
polymorphism is of two types- compile time(early or static
binding) and run time(dynamic or late binding)..
in comlite time is of two types-function overloading and
operator overloading.
in run time is of two types-virtual function and pure
virtual function..

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Question: Implement a base class Appointment and derived classes Onetime, Daily, Weekly, and Monthly. An appointment has a description (for example, “see the dentist”) and a date and time. Write a virtual function occurs_on(int year, int month, int day) that checks whether the appointment occurs on that date. For example, for a monthly appointment, you must check whether the day of the month matches. Then fill a vector of Appointment* with a mixture of appointments. Have the user enter a date and print out all appointments that happen on that date.

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